1. c. 3000 BC to c. 1500 BC
    Ancient Civilizations ★★★★★ United Kingdom

    Stonehenge

    A prehistoric megalithic monument on Salisbury Plain in southern England, built in stages from around 3000 BC. Its stones are aligned with the midsummer sunrise, and who built it and why remain largely a mystery.

  2. Around 2500 BC to around 1900 BC
    Ancient Civilizations ★★★★★ Pakistan

    Mohenjo-daro

    One of the largest city ruins of the Indus civilization, in the Indus River valley of Pakistan. Flourishing around 2500 BC, it was a planned city with grid streets, sewers and a great bath. Its script remains undeciphered, and it is also known for an urban legend that it was destroyed in an ancient nuclear war.

  3. 4th century BC (Plato's dialogues)
    Ancient Civilizations ★★★★★ Greece

    Atlantis

    A great island nation said to have sunk into the sea in a single day and night, described by the ancient Greek philosopher Plato in his dialogues. Many theories about whether it really existed are still debated.

  4. 4th century BC (Plato's writings)
    Ancient Civilizations ★★★★★ Greece

    Orichalcum

    The legendary metal said by Plato to have been mined in Atlantis, glowing red like fire. One theory says it was a copper alloy such as brass, and in 2015 ingots of an alloy were found in a shipwreck.

  5. Composed around the 4th century BC to the 4th century AD
    Ancient Civilizations ★★★★★ India

    Mahabharata

    One of the two great epics of ancient India, a story of a great war between royal houses and one of the longest stories in the world. It is also known for descriptions of the divine weapon Brahmastra, which have been called "ancient nuclear weapons."

  6. Composed between several centuries BC and several centuries AD
    Ancient Civilizations ★★★★★ India

    Ramayana

    One of the two great epics of ancient India: the adventure of Prince Rama, who rescues his abducted wife Sita. It features the flying vehicle vimana, spread across Asia, and is said to have influenced Sun Wukong of Journey to the West.

  7. Ancient times (epic)
    Ancient Civilizations ★★★★★ India

    Narayanastra

    One of the mightiest weapons in the Indian epic Mahabharata, imbued with the power of the god Vishnu. Its description of countless fiery arrows burning everything is cited as evidence for the ancient nuclear war theory.

  8. Ancient times (epics) / 20th century (texts)
    Ancient Civilizations ★★★★★ India

    Vimana

    Flying palaces and vehicles that appear in the epics and myths of ancient India. Some claim they prove ancient aircraft existed, but the text said to describe them has been shown to be a 20th-century work.